JP2016045259A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens interchangeable projection type video display device that can make a lens shift driving operation uniform irrespective of the type of a lens.SOLUTION: There is provided a projection type video display device that projects to display a video based on an input video signal on a projection screen, the projection type video display device including: lens shift driving means; lens interchanging means; and lens driving rate correction means for correcting the driving rate of the lens shift driving means on the basis of information related to the mass of a lens acquired by lens mass related information acquisition means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video display device, and more particularly to a projection-type video display device.

  2. Description of the Related Art Conventionally, there has been a projection type image display device provided with a lens shift driving unit that changes a shift driving speed in accordance with a shift driving direction.

  Patent Document 1 discloses a projector that controls the shift drive so that the shift drive speed is the same in the gravity direction and the antigravity direction according to the installation posture in the ceiling-mounted state or the normal installation state.

JP 2011-14455833 A

  However, in the prior art disclosed in the above-mentioned patent document, the shift drive speed matches according to the installation posture, but the projection-type image display device with interchangeable lenses is not taken into consideration, and the mounted lens type is changed. In this case, there is a difference in shift driving speed between different lenses.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a projection-type image display device with interchangeable lenses that can make the lens shift driving speed uniform regardless of the lens type.

  In order to achieve the above object, the present invention provides a projection-type image display device that projects and displays an image based on an input image signal on a projection surface, wherein the projection-type image display device includes a lens shift driving means and a lens exchange. A lens driving speed correction unit that corrects the driving speed of the lens shift driving unit based on information related to the lens mass acquired by the lens mass-related information acquisition unit. .

  According to the present invention, it is possible to provide a projection-type image display device in which the lens shift driving speed is made uniform regardless of the lens type.

It is a block diagram which shows the whole structure of this invention. FIG. 3 is a flowchart illustrating a process flow in the first embodiment. 6 is a block diagram illustrating an overall configuration in Embodiment 2. FIG. It is a figure which shows the whole structure of a prior art example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Hereinafter, a projection type image display apparatus according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing an overall configuration according to an embodiment of the present invention.

  The projection type video display device 10 has a video input terminal 100, a video signal processing circuit 101, a video projection optical system 102 including a lens and a display panel, a control microcomputer 103, an OSD generation circuit 104 for drawing graphics, and lens information. Lens ROM 105, optical drive device 106 including motors for driving lens shift, nonvolatile memory 107 for recording set values of operated items, distance measuring sensor 108 for measuring the distance to the projection surface, and accepting user operations The operation detection unit 109 is configured.

  At the time of activation, the projection display apparatus 10 acquires an ID indicating a lens type from the lens ROM 105 as shown in the flowchart of FIG. The control microcomputer 103 determines whether or not the lens has been exchanged by comparing with the previously acquired lens ID. When it is determined that lens replacement has been performed, information related to lens mass is acquired. Examples of information related to the lens mass include the mass of the lens itself and the penetrating moment due to the length of the lens barrel.

As a method for acquiring information related to the lens mass, the control microcomputer 103 acquires lens information from the acquired lens ID by referring to a lens correspondence table provided on the control microcomputer side. Lens mass related information to be used for lens shift drive control is calculated from the acquired lens information, and this parameter is used for lens shift drive. In calculating the lens mass related information, at least the lens mass and the length of the lens barrel are used as the lens information.

When the lens shift driving is executed, the optical driving device 106 is controlled so as to operate at a predetermined speed based on the calculated lens mass related information.

According to the control of this embodiment, even if the lens is exchanged and the lens type is changed, the lens shift drive can be executed at a constant speed, so that the user can perform the lens shift drive without a sense of incongruity.
It is possible to equalize the speed between different lenses based on how much the position has moved when a certain drive pulse is given to the lens shift drive device, but this requires an encoder, leading to increased costs. .

  According to the method of this embodiment, there is an advantage that the speed of lens shift driving can be made uniform by using an inexpensive ROM without using an expensive encoder.

  In the first embodiment, as a means for acquiring information related to the lens mass, the control microcomputer includes a calculation table associated with the lens ID, and the information related to the lens mass is calculated on the control microcomputer side based on the lens ID. However, information related to the lens mass may be recorded in the lens ROM 105 in advance, and the control microcomputer 103 may read and use the information. In this case, the internal microcomputer processing in the control microcomputer 103 is reduced, and the efficiency is improved. Processing after the control microcomputer 103 acquires information related to the lens mass is the same as that in the first embodiment.

  In Example 1 and Example 2, lens mass-related information was acquired and lens shift drive control was performed based on information written in the lens ROM, but the weight of the lens attached by the mass sensor was measured. Also good. Hereinafter, a projection type image display apparatus according to a third embodiment of the present invention will be described with reference to FIG.

  The projection type video display device 10 has a video input terminal 100, a video signal processing circuit 101, a video projection optical system 102 including a lens and a display panel, a control microcomputer 103, an OSD generation circuit 104 for drawing graphics, and lens information. Lens ROM 105, optical drive device 106 including motors for driving lens shift, nonvolatile memory 107 for recording set values of operated items, distance measuring sensor 108 for measuring the distance to the projection surface, and accepting user operations The operation detection unit 109 includes a mass sensor 110 for measuring the mass of the lens.

  The projection display apparatus 10 acquires the value of the mass sensor 110 connected to the lens when activated. Based on the value acquired from the mass sensor, lens shift drive control is performed.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 10 Projection type video display apparatus, 100 Video signal input terminal, 101 Video signal processing circuit,
102 video projection optical system, 103 control microcomputer, 104 OSD generation circuit,
105 lens ROM, 106 optical driving device, 107 nonvolatile memory,
108 ranging sensor, 109 operation detection unit

Claims (5)

In a projection-type image display device that projects and displays an image based on an input image signal on a projection surface,
The projection-type image display device drives lens shift driving means based on information related to lens mass acquired by lens shift driving means, lens exchange means, lens exchange detection means, and lens mass related information acquisition means. And a lens driving speed correcting means for correcting the speed.   The projection type image display according to claim 1, wherein the lens replacement detection unit determines whether or not the lens has been replaced by reading a lens ID indicating a lens type from a nonvolatile memory provided on the lens side. apparatus.   The lens mass related information acquisition unit reads a lens ID indicating a lens type from a nonvolatile memory provided on the lens side, and calculates lens mass related information associated with the lens ID on the projection-type image display device side. The projection-type image display apparatus according to claim 1, wherein information related to mass is acquired.   The projection type image display device according to claim 1, wherein the lens mass related information acquisition unit acquires the lens mass related information by reading information related to the lens mass from a nonvolatile memory provided on the lens side.   3. The lens mass related information acquisition unit reads information related to the lens mass by acquiring a measurement value by a weight sensor included in the projection display apparatus. Projection type image display device.